wtw Multi 350i, Operating Manual

Page: 29 / 108

Multi 350i Operation
27
4.4.2 Measuring the pH value
AutoRead
(Drift control)
The AutoRead function (drift control) continually checks the stability of
the measurement signal. The stability has a considerable impact on the
reproducibility of measured values. The display of the measured vari-
able flashes until a stable measured value is available.
Criteria With identical measurement conditions, the following applies:
1 Perform the preparatory activities according to section 4.6.1.
2 Immerse the pH electrode in the test sample.
3 Select the pH or mV display with <M> .
pH
6.949
24.8
°C
Measured
variable Reproducibility Response time
pH value Better than 0.01 > 30 seconds